# US 4,399,838 A · Heating control cock > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,399,838 A - Document ID: US4399838A - Status: Granted - Kind: A - Application number: 06/242,482 - Filed: 1981-03-11 - Granted: 1983-08-23 - Earliest claimed: 1980-03-31 - Assignees: Valeo - Inventors: Yves Poujol - Web page: https://patentgrep.com/patent/US4399838A ## CPC - B60H 1/00485: {Valves for air-conditioning devices, e.g. thermostatic valves} - F16K 11/074: with flat sealing faces - Y10T 137/7036: Jacketed - Y10T 137/86726: Valve with bypass connections - Y10T 137/86863: Rotary valve unit - B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES - F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)} - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A heating cock for a motor vehicle, comprising a cylindrical shell rotatably mounted about its axis in half-casings carrying fluid supply pipes and fluid return pipes, said cock allowing in its closed condition, connecting directly a supply pipe to a return pipe, the path of travel of the fluid in the shell being thermally insulated from the other pipes. ## Claims ### Claim 1 A control cock operative to be mounted between the ends of four pipes, said pipes comprising first fluid supply and return pipes on one side of the cock and second fluid supply and return pipes on the other side, said control cock comprising a cylindrical shell rotatably and sealingly mounted about its axis between the ends of the pipe, said cylindrical shell being rotatable through intermediate conditions between a fully opened position and a fully closed position; said cylindrical shell having disposed therein at least two longitudinal passages which in said fully opened position enable fluid communication between said first and second supply pipes and said first and second return pipes, respectively; said cylindrical shell having a first by-pass channel for enabling fluid communication only between said first fluid supply and return pipes when said cylindrical shell is in said closed position, said first by-pass channel being separated from the ends of the second pipes by a confined space at least partially surrounding the by-pass channel, said space containing a thermal insulating agent; and said cylindrical shell having a second by-pass channel for enabling partial fluid communication between said first fluid supply and return pipes as well as two through-going openings for enabling partial fluid communication between said first and second fluid supply pipes and said first and second fluid return pipes, respectively, while the shell is disposed intermediately between the fully opened and fully closed position. ### Claim 2 (depends on 1) A cock according to claim 1, wherein the thermal insulating agent is air. ### Claim 3 (depends on 1) A cock according to claim 1, wherein the second by-pass channel is without communication with the first by-pass channel. ### Claim 4 (depends on 1) A cock according to claim 1 wherein the cross section of the second by-pass channel is less than that of the first by-pass channel. ### Claim 5 (depends on 1) A cock according to claim 1, wherein the surface in cross-section of the through-going openings is less than that of the said cylindrical passages. ### Claim 6 (depends on 1) A cock according to claim 1, wherein the cross-section of the cylindrical passages is substantially equal to that of said pipes and to that of the first by-pass channel. ### Claim 7 (depends on 1) A cock according to claim 1, wherein the shell is formed of several discs axially stacked and fixed to each other. ### Claim 8 (depends on 7) A cock according to claim 7, wherein the shell comprises: a first disc, situated on the side of the first pipes, in which are formed the second by-pass channel and four through-going identical passages angularly spaced from each other; a second disc or median disc, in which are formed two through-going passages axially aligned with two through-going passages of the first disc, and the first by-pass channel the ends of which are in alignment with the two other through-going passages of the first disc; and a third disc situated on the side of the second pipes and comprising two through-going passages in axial alignment with the two through-going passages of the second disc. ### Claim 9 (depends on 8) A cock according to claim 8, wherein the first by-pass channel is formed as a recess on the face of the second disc which is applied on the first disc and is partly closed between its ends by the corresponding face of the first disc. ### Claim 10 (depends on 9) A cock according to claim 9, wherein the second disc comprises a cylindrical skirt integral with an inner web forming the first by-pass channel and defining a hollow space about said channel, which is tightly closed by the third aforementioned disc. ### Claim 11 (depends on 8) A cock according to claim 8, wherein the aforementioned though-going openings are formed through the three discs. ### Claim 12 (depends on 8) A cock according to claim 8, wherein the discs are made of a plastics material. ### Claim 13 (depends on 1) A cock according to claim 1, wherein the said shell is rigidly connected, at its end adjacent the second pipes, to an axial shaft rotatably supported in bearings of a casing containing the shell, the end of said shaft being rigidly connected to an operating lever of the shell. ### Claim 14 (depends on 1) The cock of claim 1 wherein the through-going openings have a cross-section which progressively decreases in the direction from the opened condition to the closed position. ### Claim 15 (depends on 1) The cock of claim 1 wherein the shell moves from the fully opened position to the fully closed position in one quarter of a full turn.